Color filter and display panel using same

ABSTRACT

A color filter includes a first filtering part and a number of first quantum dot particles formed in the first filtering part. A color of the first filtering part is a first primary color. The first quantum dot particles convert a light having a wavelength less than a wavelength of the first primary color to a light with the first primary color.

FIELD

The disclosure generally relates to color filter and display paneltechnologies.

BACKGROUND

A color filter usually only lets a light with a specific color throughand absorbs the light of the other colors. Thus, a light transmittanceof the color filter is low and a lot of backlight is wasted afterpassing through the color filter.

BRIEF DESCRIPTION OF THE DRAWINGS

Many aspects of the disclosure can be better understood with referenceto the following drawings. The components in the drawings are notnecessarily drawn to scale, the emphasis instead being placed uponclearly illustrating the principles of the disclosure. Moreover, in thedrawings, like reference numerals designate corresponding partsthroughout the views.

FIG. 1 is an isometric view of a first embodiment of a display panel.

FIG. 2 is a cross-sectional view of the display panel of FIG. 1, takenalong line II-II.

FIG. 3 is similar to FIG. 2, but showing a varying density distributionof a number of quantum dot particles in a color filter of the displaypanel of FIG. 1.

FIG. 4 is a cross-sectional view of a second embodiment of a displaypanel.

FIG. 5 is a cross-sectional view of a third embodiment of a displaypanel.

FIG. 6 is an isometric view of a fourth embodiment of a display panel.

FIG. 7 is a cross-sectional view of the display panel of FIG. 5, takenalong line VI-VI.

FIG. 8 is a cross-sectional view of a fifth embodiment of a displaypanel.

FIG. 9 is a cross-sectional view of a sixth embodiment of a displaypanel.

DETAILED DESCRIPTION

It will be appreciated that for simplicity and clarity of illustration,where appropriate, reference numerals have been repeated among thedifferent figures to indicate corresponding or analogous elements. Inaddition, numerous specific details are set forth in order to provide athorough understanding of the embodiments described herein. However, itwill be understood by those of ordinary skill in the art that theembodiments described herein can be practiced without these specificdetails. In other instances, methods, procedures and components have notbeen described in detail so as not to obscure the related relevantfeature being described. Also, the description is not to be consideredas limiting the scope of the embodiments described herein. The drawingsare not necessarily to scale and the proportions of certain parts may beexaggerated to better illustrate details and features of the presentdisclosure.

The term “comprising,” when utilized, means “including, but notnecessarily limited to”; it specifically indicates open-ended inclusionor membership in the so-described combination, group, series and thelike.

FIG. 1 illustrates an isometric view of a first embodiment of a displaypanel 1. FIG. 2 illustrates a cross-sectional view of the display panel1 of FIG. 1, taken along line II-II. FIG. 2 illustrates one pixel area100 for example. The display panel 1 displays a full color image. Thedisplay panel 1 can be a liquid crystal display (LCD) panel or anorganic light emitting diode (OLED) display panel. In this embodiment,the display panel 1 is an OLED display panel.

The display panel 1 includes a first substrate 11, a second substrate 12opposite to the first substrate 11, a lighting device 13, and a colorfilter 14.

The lighting device 13 is formed on the first substrate 11 andconfigured to emit a backlight. In this embodiment, the lighting device13 is an OLED array substrate. The OLED array substrate includes anumber of thin film transistors (not shown) to control a number of OLEDSto emit a white backlight.

The color filter 14 is formed on the second substrate 12. The colorfilter 14 receives the backlight from the lighting device 13 andconverts the backlight to light with different colors for displaying afull color image. The color filter 14 defines a number of pixel areas100. Each pixel area 100 includes a number of sub-pixels 101 forrespectively converting the backlight to the light with differentcolors. In this embodiment, the display panel 1 employs three-primarycolor lights to display the full color image. The sub-pixels 101 can bea first sub-pixel 102, a second sub-pixel 103, and a third sub-pixel104. The first sub-pixel 102 emits a red light. The second sub-pixel 103emits a green light. The third sub-pixel 104 emits a blue light. In theother embodiment, the color filter 14 can be formed on the lightingdevice 13 of the first substrate 11.

The color filter 14 includes a number of filtering parts 140 withdifferent colors, a black matrix 142, and a number of quantum dotparticles 143 formed in the filtering parts 140. The filtering parts 140with different colors are divided by the black matrix 142 andrespectively correspond to the sub-pixels 101 for respectivelyconverting the backlight to light with different colors.

The filtering parts 140 are made of photoresist material and include dyewith a color corresponding to the color of converted light. The bases140 can be formed on the second substrate 12 by a photolithographyprocess, an ink jet printing process, a microtransfer process, or a silkscreen printing process.

The quantum dot particles 143 are made of an inorganic nano-materialwhich can convert the backlight having a wavelength less than awavelength of a light with a specific color to the light with thespecific color. In this embodiment, the quantum dot particles 143includes a number of red quantum dot particles 1430 and a number ofgreen quantum dot particles 1432. The red quantum dot particles 1430converts the light having a wavelength less than a wavelength of redlight to the red light. The green quantum dot particles 1432 convertsthe light having a wavelength less than a wavelength of green light tothe green light. In this embodiment, the quantum dot particles 143 areevenly formed in the filtering parts 140. In the other embodiment, adensity of the quantum dot particles 143 is varied in different portionsof the filtering parts 140. For example, referring to FIG. 3, a densityof the quantum dot particles 143 near the lighting device 13 is greaterthan a density of the quantum dot particles 143 away from the lightingdevice 13.

In this embodiment, the color filter 14 includes a transparent firstfiltering part 1401 corresponding to the first sub-pixel 102, a greensecond filtering part 1402 corresponding to the second sub-pixel 103,and a blue third filtering part 1403 corresponding to the thirdsub-pixel 104. The red quantum dot particles 1430 are formed in thetransparent first filtering part 1401. The green quantum dot particles1432 are formed in the green second filtering part 1402. There is noquantum dot particle 143 in the blue third filtering part 1403. In theother embodiment, the color of the first filtering part 1401corresponding to the first sub-pixel 402 can be red which is the samecolor of the light emitted from the first sub-pixel 402.

The red quantum dot particles 1430 formed in the transparent firstfiltering part 1401 can convert a blue part and a green part of thewhite backlight passing through the first sub-pixel 102 to the redlight. The green quantum dot particles 1432 formed in the green secondfiltering part 1402 can convert a blue part of the white backlightpassing through the second sub-pixel 103 to the green light. Thus, mostof the white backlight can pass through the color filter 14 and be usedto display an image. The light transmittance of the color filter 14 isimproved.

FIG. 4 illustrates a cross-sectional view of a second embodiment of adisplay panel 2. In this embodiment, the display panel 2 is an OLEDdisplay panel. The display panel 2 includes a first substrate 21, asecond substrate 22 opposite to the first substrate 21, a lightingdevice 23, and a color filter 24.

The lighting device 23 is formed on the first substrate 21 andconfigured to emit a backlight. In this embodiment, the lighting device23 is an OLED array substrate for emitting a white backlight.

The color filter 24 is formed on the second substrate 12. The colorfilter 24 defines a number of pixel areas 200. Each pixel area 200includes a number of sub-pixels 201 for respectively converting thebacklight to the light with different colors. The color filter 24includes a number of filtering parts 240 with different colors, a blackmatrix 242, and a number of quantum dot particles 243 formed in thefiltering parts 240. The filtering parts 240 with different colors aredivided by the black matrix 242 and respectively correspond to thesub-pixels 201 for respectively converting the backlight to the lightwith different colors. The color filter 24 receives the backlight fromthe lighting device 23 and converts the backlight to light withdifferent colors for displaying a full color image.

In this embodiment, each pixel area 200 defines a first sub-pixel 202, asecond sub-pixel 203, a third sub-pixel 204, and a fourth sub-pixel 205.The first sub-pixel 202 emits a red light. The second sub-pixel 203emits a green light. The third sub-pixel 204 emits a blue light. Thefourth sub-pixel 205 emits a white light to increase a brightness of thepixel area 200. The color filter 24 includes a transparent firstfiltering part 2401 corresponding to the first sub-pixel 202, a greensecond filtering part 2402 corresponding to the second sub-pixel 203, ablue third filtering part 2403 corresponding to the third sub-pixel 204,a transparent fourth filtering part 2404 corresponding to the fourthsub-pixel 205, a number of red quantum dot particles 2430 formed in thetransparent first filtering part 2401, and a number of green quantum dotparticles 2432 formed in the green second filtering part 2402. There isno quantum dot particles 243 in the blue third filtering part 2403 andthe transparent fourth filtering part 2404. The white backlight passesthrough the transparent fourth filtering part 2404 without any colorconversion. In the other embodiment, the color of the first filteringpart 2401 corresponding to the first sub-pixel 202 can be red which isthe same color of the light emitted from the first sub-pixel 202.

FIG. 5 illustrates a cross-sectional view of a third embodiment of adisplay panel 3. In this embodiment, the display panel 3 is an OLEDdisplay panel. The display panel 3 includes a first substrate 31, asecond substrate 32 opposite to the first substrate 31, a lightingdevice 33, and a color filter 34.

The lighting device 33 is formed on the first substrate 31 andconfigured to emit a backlight. In this embodiment, the lighting device33 is an OLED array substrate for emitting a blue backlight.

The color filter 34 is formed on the second substrate 32. The colorfilter 34 defines a number of pixel areas 300. Each pixel area 300includes a number of sub-pixels 301 for respectively converting thebacklight to the light with different colors. The color filter 34includes a number of filtering parts 340 with different colors, a blackmatrix 342, and a number of quantum dot particles 343 formed in thefiltering parts 340. The filtering parts 340 with different colors aredivided by the black matrix 342 and respectively corresponding to thesub-pixels 301 for respectively converting the backlight to the lightwith different colors. The color filter 34 receives the backlight fromthe lighting device 33 and converts the backlight to light withdifferent colors for displaying a full color image.

In this embodiment, each pixel area 300 defines a first sub-pixel 302, asecond sub-pixel 303, and a third sub-pixel 304. The first sub-pixel 302emits a red light. The second sub-pixel 303 emits a green light. Thethird sub-pixel 304 emits a blue light. The color filter 34 includes atransparent first filtering part 3401 corresponding to the firstsub-pixel 302, a transparent second filtering part 3402 corresponding tothe second sub-pixel 303, a transparent third filtering part 3403corresponding to the third sub-pixel 304, a number of red quantum dotparticles 3430 formed in the transparent first filtering part 3401, anda number of green quantum dot particles 3432 formed in the transparentsecond filtering part 3402. There are no quantum dot particles 343 inthe transparent third filtering part 2403. In the other embodiment, thecolor of the first filtering part 3401 corresponding to the firstsub-pixel 302 can be red which is the same color of the light emittingfrom the first sub-pixel 302. The color of the second filtering part3402 corresponding to the second sub-pixel 303 can be green which is thesame color of the light emitted from the second sub-pixel 303.

FIG. 6 illustrates an isometric view of a fourth embodiment of a displaypanel 4. FIG. 7 illustrates a cross-sectional view of the display panel4 of FIG. 5, taken along line VI-VI. FIG. 7 illustrates one pixel area400 for example. The display panel 4 displays a full color image. Inthis embodiment, the display panel 4 is a LCD panel.

The display panel 4 includes a first substrate 41, a second substrate 42opposite to the first substrate 41, a liquid crystal layer 43 setbetween the first substrate 41 and the second substrate 43, a colorfilter 44 is formed on the second substrate 43, and a backlight module45 set below the first substrate 41 for emitting a backlight. The firstsubstrate 41 is an array substrate with a thin film transistor (TFT)array 46.

The color filter 44 defines a number of pixel areas 400. Each pixel area400 includes a number of sub-pixels 401 for respectively converting thebacklight to the light with different colors. Each TFT 460 of the TFTarray 46 corresponding to one of the sub-pixels 401 controls a rotationof the liquid crystal molecules of the liquid crystal layer 43 in thesub-pixel 401 to adjust a light transmittance of the sub-pixel 401. Inthis embodiment, the display panel 4 employs three-primary color lightsto display the full color image. The sub-pixels 401 can be a firstsub-pixel 402, a second sub-pixel 403, and a third sub-pixel 404. Thefirst sub-pixel 402 emits a red light. The second sub-pixel 403 emits agreen light. The third sub-pixel 404 emits a blue light. The backlight45 emits a white backlight.

The color filter 44 includes a number of filtering parts 440 withdifferent colors, a black matrix 442, and a number of quantum dotparticles 443 formed in the filtering parts 440. The filtering parts 440with different colors are divided by the black matrix 442 andrespectively corresponding to the sub-pixels 401 for respectivelyconverting the backlight to the light with different colors.

In this embodiment, the color filter 44 includes a transparent firstfiltering part 4401 corresponding to the first sub-pixel 402, a greensecond filtering part 4402 corresponding to the second sub-pixel 403, ablue third filtering part 4403 corresponding to the third sub-pixel 404,a number of red quantum dot particles 4430 formed in the transparentfirst filtering part 4401, and a number of green quantum dot particles4432 formed in the green second filtering part 4402. There is no quantumdot particle 443 in the blue third filtering part 4403.

FIG. 8 illustrates a cross-sectional view of a fifth embodiment of adisplay panel 5. In this embodiment, the display panel 5 is a LCD panel.The display panel 5 includes a first substrate 51, a second substrate 52opposite to the first substrate 51, a liquid crystal layer 53 setbetween the first substrate 51 and the second substrate 53, a colorfilter 54 formed on the second substrate 53, and a backlight module 55set below the first substrate 51 for emitting a backlight.

The color filter 54 defines a number of pixel areas 500. Each pixel area500 includes a number of sub-pixels 501 for respectively converting thebacklight to the light with different colors. In this embodiment, thedisplay panel 5 employs three-primary color lights to display the fullcolor image. The sub-pixels 501 can be a first sub-pixel 502, a secondsub-pixel 503, and a third sub-pixel 504. The first sub-pixel 502 emitsa red light. The second sub-pixel 503 emits a green light. The thirdsub-pixel 504 emits a blue light. The backlight 55 emits a bluebacklight.

The color filter 54 includes a number of filtering parts 540 withdifferent colors, a black matrix 542, and a number of quantum dotparticles 543 formed in the filtering parts 540. The filtering parts 540with different colors are divided by the black matrix 542 andrespectively correspond to the sub-pixels 501 respectively convertingthe backlight to the light with different colors.

In this embodiment, the color filter 54 includes a transparent firstfiltering part 5401 corresponding to the first sub-pixel 502, atransparent second filtering part 5402 corresponding to the secondsub-pixel 503, a transparent third filtering part 5403 corresponding tothe third sub-pixel 504, a number of red quantum dot particles 5430formed in the transparent first filtering part 5401, and a number ofgreen quantum dot particles 5432 formed in the transparent secondfiltering part 5402. There is no quantum dot particle 543 in thetransparent third filtering part 5403.

FIG. 9 illustrates a cross-sectional view of a sixth embodiment of adisplay panel 6. In this embodiment, the display panel 6 is a LCD panel.The display panel 6 includes a first substrate 61, a second substrate 62opposite to the first substrate 61, a liquid crystal layer 63 setbetween the first substrate 61 and the second substrate 63, a colorfilter 64 formed on the first substrate 61, and a backlight module 65set below the first substrate 61 for emitting a backlight.

The color filter 64 defines a number of pixel areas 600. Each pixel area600 includes a number of sub-pixels 601 for respectively converting thebacklight to the light with different colors. In this embodiment, thedisplay panel 6 employs three-primary colors light to display the fullcolor image. The sub-pixels 601 can be a first sub-pixel 602, a secondsub-pixel 603, a third sub-pixel 604, and a fourth sub-pixel 605. Thefirst sub-pixel 602 emits a red light. The second sub-pixel 603 emits agreen light. The third sub-pixel 604 emits a blue light. The fourthsub-pixel 605 emits a white light to increase a brightness of the pixelarea 600. The backlight 65 emits a white backlight.

The color filter 64 includes a number of filtering parts 640 withdifferent colors, a black matrix 642, and a number of quantum dotparticles 643 formed in the filtering parts 640. The filtering parts 640with different colors are divided by the black matrix 642 andrespectively correspond to the sub-pixels 601 for respectivelyconverting the backlight to the light with different colors.

In this embodiment, the color filter 64 includes a transparent firstfiltering part 6401 corresponding to the first sub-pixel 602, a greensecond filtering part 6402 corresponding to the second sub-pixel 603, ablue third filtering part 6403 corresponding to the third sub-pixel 604,a transparent fourth filtering part 6404 corresponding to the fourthsub-pixel 605, a number of red quantum dot particles 6430 formed in thetransparent first filtering part 6401, and a number of green quantum dotparticles 6432 formed in the green second filtering part 6402. There isno quantum dot particle 643 in the blue third filtering part 6403 andthe transparent fourth filtering part 6404. The white backlight passesthrough the transparent fourth filtering part 6404 without any colorconversion.

It is believed that the present embodiments and their advantages will beunderstood from the foregoing description, and it will be apparent thatvarious changes may be made thereto without departing from the scope ofthe disclosure or sacrificing all of its material advantages.

What is claimed is:
 1. A display panel comprising: a lighting deviceemitting a white light; and a color filter layer converting the whitelight to light with three-primary colors; wherein the color filter layercomprises a first filtering part, a second filtering part, and a thirdfiltering part; a plurality of first quantum dot particles is formed inthe first filtering part, a plurality of second quantum dot particles isformed in the second filtering part, and no quantum dots particle isformed in the third filtering part; the first filtering part only allowsgreen light to pass through, the second filtering part only allows redlight to pass through, the third filtering part only allows blue lightto pass through; wherein the first filtering part comprises photoresistmaterial; the plurality of first quantum dot particles is dispersed inthe photoresist material; and wherein a density of the first quantum dotparticles dispersed in the photoresist material near the lighting deviceis greater than a density of the first quantum dot particles dispersedin the photoresist material away from the lighting device.
 2. Thedisplay panel of claim 1, wherein the first quantum dot particles arecapable of converting light having a wavelength less than a wavelengthof green light to green light; the second quantum dot particles arecapable of converting light having a wavelength less than a wavelengthof red light to red light.
 3. The display panel of claim 1, wherein thecolor filter further comprises a fourth filtering part, the fourthfiltering part is transparent and comprises no quantum dot particlesformed therein, the fourth filtering part only allows white light topass through.
 4. The display panel of claim 1, wherein the lightingdevice is an organic light emitting diode array substrate.
 5. A displaypanel comprising: a lighting device emitting a blue backlight; and acolor filter converting the blue backlight to light with three-primarycolors; wherein the color filter layer comprises a first filtering part,a second filtering part, and a third filtering part; a plurality offirst quantum dot particles is formed in the first filtering part, aplurality of second quantum dot particles is formed in the secondfiltering part, and no quantum dots particle is formed in the thirdfiltering part; the first filtering part only allows green light to passthrough, the second filtering part only allows red light to passthrough, the third filtering part only allows blue light to passthrough; wherein the first filtering part comprises photoresistmaterial; the plurality of first quantum dot particles is dispersed inthe photoresist material; and wherein a density of the first quantum dotparticles dispersed in the photoresist material near the lighting deviceis greater than a density of the first quantum dot particles dispersedin the photoresist material away from the lighting device.
 6. Thedisplay panel of claim 5, wherein the first quantum dot particles arecapable of converting light having a wavelength less than a wavelengthof green light to green light; the second quantum dot particles arecapable of converting light having a wavelength less than a wavelengthof red light to red light.